违反了 PRIMARY KEY 约束 'PK_t_counter'。不能在对象 'dbo.t_counter' 中插入重复键。 语句已终止。 耦合模式FGOALS-s2模拟的大西洋经圈翻转环流(AMOC)的年代际变率-Decadal Variability of Atlantic Meridional Overturning Circulation (AMOC) in FGOALS-s2
doi:  10.3878/j.issn.1006-9585.2017.17047
耦合模式FGOALS-s2模拟的大西洋经圈翻转环流(AMOC)的年代际变率

Decadal Variability of Atlantic Meridional Overturning Circulation (AMOC) in FGOALS-s2
摘要点击 423  全文点击 125  投稿时间:2017-03-21  修订日期:2017-04-21
查看HTML全文   下载PDF   查看/发表评论  下载PDF阅读器
基金:  国家重点基础研究发展计划,国家自然科学基金
中文关键词:  气候系统模式 大西洋经向翻转流(AMOC) 年代际变率
英文关键词:  Climate system model, Atlantic Meridional Overturning Circulation (AMOC), decadal variability
     
作者中文名作者英文名单位
李晓兰LIXIAOLAN中国科学院大气物理研究所
俞永强YUYONGQIANG中国科学院大气物理研究所
引用:李晓兰,俞永强..耦合模式FGOALS-s2模拟的大西洋经圈翻转环流(AMOC)的年代际变率[J].气候与环境研究
Citation:LIXIAOLAN,YUYONGQIANG..Decadal Variability of Atlantic Meridional Overturning Circulation (AMOC) in FGOALS-s2[J].Climatic and Environmental Research(in Chinese)
中文摘要:
      利用中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室(LASG)发展的耦合的气候系统模式FGOALS-s2工业革命前控制试验结果研究了大西洋经向翻转流(AMOC)的年代际变率及其物理机制。传统AMOC是利用深度坐标下的质量流函数来表征,本文通过对密度坐标下49.5°N的AMOC指数与其余纬度的AMOC指数作相关分析,发现AMOC的变化有从深水形成区向南传播的过程,且密度坐标下的AMOC变率在北大西洋高纬度明显大于低纬度。分析进一步表明,模式模拟的AMOC具有年代际振荡,周期约为70年。这个低频振荡主要是由与AMOC变化相关的温度和盐度的变化与海表风场之间的相互作用引起,具体机制如下:格陵兰-冰岛-挪威海(Greenland–Iceland–Norwegian (GIN) seas)有异常强的海表风场,导致蒸发增强,继而使海表盐度增加,深水形成增多,从而使AMOC增强。而AMOC加强后,会使得向北的热量和盐度输送增加,减弱此处的经向温度梯度,从而使风场减弱,完成位相的反转。
Abstract:
      Decadal variability of Atlantic Meridional Overturning Circulation (AMOC) has been studied in the Flexible Global Ocean–Atmosphere–Land System model,version s2 (FGOALS-s2) preindustrial simulation. Traditionally, the streamfunction on depth coordinate is used to represent AMOC. According to correlations between AMOC index on density coordinate at 49.5°N and AMOC index at all latitudes north of 34°S, we find AMOC variations propagate southward from the deep-water formation region. Furthermore, AMOC variability on density coordinate is larger at high latitudes North Atlantic than at low latitudes and South Atlantic. Moreover, AMOC shows low-frequency variability with a period of about 70 year. The low-frequency oscillation is related to the interactions between temperature and salinity variations associated with AMOC variations and surface wind. The physics of this decadal variability is as follows: the surface wind in the Greenland–Iceland–Norwegian (GIN) seas is anomalously strong, leading to anomalously strong evaporation and thus the positive sea surface salinity (SSS) anomalies. The SSS anomalies strengthen the convection in the GIN seas and subsequently the strength of the AMOC. This leads to a strengthened northward heat transport, decreasing the meridional temperature gradient and the surface wind, which completes the phase reversal.
主办单位:中国科学院大气物理研究所 单位地址:北京市9804信箱
联系电话: 010-82995048,010-82995049传真:010-82995048 邮编:100029 Email:qhhj@mail.iap.ac.cn
本系统由北京勤云科技发展有限公司设计
京ICP备09060247号